Text 7] The Residents of Jambūdvipa Offer Prayers
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Canto of Śrimad-Bhāgavatam, I shall describe to you how Prahlāda Mahārāja caused the Lord to assume the form of Nṛsiṁhadeva. Prahlāda Mahārāja, the topmost devotee of the Lord, is a reservoir of all the good qualities of great personalities. His character and activities have delivered all the fallen members of his demoniac family. Lord Nṛsiṁhadeva is very dear to this exalted personality. Thus Prahlāda Mahārāja, along with his servants and all the denizens of Hari-varṣa, worships Lord Nṛsiṁhadeva by chanting the following mantra.
PURPORT
Jayadeva Gosvāmī's ten prayers worshiping the incarnations of Lord Kṛṣṇa (Keśava) contain His name in every stanza. For example,  keśava dhṛta-nara-hari-rūpa jaya jagad-īśa hare, keśava dhṛta-mīna-śarīra jaya jagad-īśa hare,  and  keśava dhṛta-vāmana-rūpa jaya jagad-īśa hare . The word  jagad-īśa  refers to the proprietor of all the universes. His original form is the two-handed form of Lord Kṛṣṇa, standing with a flute in His hands and engaged in tending the cows. As stated in  Brahma-saṁhitā :
cintāmaṇi-prakara-sadmasu kalpa-vṛkṣa- lakṣāvṛteṣu surabhīr abhipālayantam lakṣmī-sahasra-śata-sambhrama-sevyamānaṁ govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
“I worship Govinda, the primeval Lord, the first progenitor, who is tending the cows, yielding all desires, in abodes built with spiritual gems and surrounded by millions of purpose trees. He is always served with great reverence and affection by hundreds and thousands of goddesses of fortune.” From this verse we learn that Govinda, or Kṛṣṇa, is the  ādi-puruṣa  (the original person). The Lord has innumerable incarnations, exactly like the innumerable waves of a flowing river, but the original form is Kṛṣṇa, or Keśava.
Śukadeva Gosvāmī refers to Nṛsiṁhadeva because of Prahlāda Mahārāja. Prahlāda Mahārāja was put into great distress by his powerful father, the demon Hiraṇyakaśipu. Apparently helpless before him, Prahlāda Mahārāja called on the Lord, who immediately assumed the